vtk对stl文件进行下采样

在加载stl文件的时候有些文件的mesh太多致使加载速度太慢须要进行下采样,以便提升加载速度,可使用vtk提供的vtkDecimatePro进行下采样.

#include <vtkPolyData.h>
#include <vtkSTLReader.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtk-8.1/vtkCleanPolyData.h>
#include <vtk-8.1/vtkDecimatePro.h>
#include <vtk-8.1/vtkSTLWriter.h>
#include "logger/Logger.h"

int main(int argc, char *argv[]) {

    std::string inputFilename = "large.stl";

    vtkSmartPointer<vtkSTLReader> reader =
            vtkSmartPointer<vtkSTLReader>::New();
    reader->SetFileName(inputFilename.c_str());
    reader->Update();

    vtkSmartPointer<vtkPolyData> stlData = reader->GetOutput();
    LOG_INFO << stlData->GetNumberOfPoints();

    //只保留2000个点
    double d = 1-2000.0/stlData->GetNumberOfPoints();
    vtkSmartPointer<vtkDecimatePro> decimate =
            vtkSmartPointer<vtkDecimatePro>::New();
    decimate->SetInputData(stlData);
    decimate->PreserveTopologyOff();
    decimate->SplittingOn();
    decimate->BoundaryVertexDeletionOn();
    decimate->SetTargetReduction(d);

    decimate->Update();

    vtkSmartPointer<vtkPolyData> decimated =
            vtkSmartPointer<vtkPolyData>::New();
    decimated->ShallowCopy(decimate->GetOutput());

    LOG_INFO << decimated->GetNumberOfPoints();

    std::string filename = "small.stl";
    vtkSmartPointer<vtkSTLWriter> stlWriter =
            vtkSmartPointer<vtkSTLWriter>::New();
    stlWriter->SetFileName(filename.c_str());
    stlWriter->SetInputData(decimated);
    stlWriter->Write();
    return 0;
}

 

 

decimate->PreserveTopologyOff();

decimate->SplittingOn();

decimate->BoundaryVertexDeletionOn();

 

这几行设置是确保下采样比例可以到指定比例,不然可能没法到达你设置的采样比.